Novel nickel‐based catalytic systems for the CHarylation of azoles with haloarenes and aryl triflates have been developed. We have established that Ni(OAc)2/bipy/LiOtBu serves as a general catalytic system for the coupling with aryl bromides and iodides as aryl electrophiles. For couplings with more challenging electrophiles, such as aryl chlorides and triflates, the Ni(OAc)2/dppf (dppf=1,1′‐bis
对于C新颖的镍基催化体系与卤代芳烃和芳基三氟甲磺酸酯唑h的芳基化得到了发展。我们已经确定,Ni(OAc)2 / bipy / LiO t Bu用作与芳基溴化物和碘化物作为芳基亲电子试剂偶联的一般催化体系。对于与更具挑战性的亲电试剂(例如芳基氯化物和三氟甲磺酸酯)偶联,发现Ni(OAc)2 / dppf(dppf = 1,1'-bis(diphenylphosphino)ferrocene)系统是有效的。噻唑,苯并噻唑,恶唑,苯并恶唑和苯并咪唑可用作杂芳烃偶联伴侣。经过进一步研究,我们发现了使用Mg(O t Bu)2进行本偶联的新方案作为LiO t Bu的温和且便宜的替代品。还描述了试图揭示这种镍催化的杂联芳基偶联机理的尝试。该新开发的方法已成功应用于非布索坦(一种有效治疗痛风和高尿酸血症的黄嘌呤氧化酶抑制剂),他法米第(一种有效治疗TTR淀粉样蛋白多神经病的药物)和texaline(一种天然的抗结核药物)的合成活动)。
Ruthenium(II)-catalyzed synthesis of 2-arylbenzimidazole and 2-arylbenzothiazole in water
作者:Keisham S. Singh、Francis Joy、Prabha Devi
DOI:10.1007/s11243-020-00435-3
日期:2021.3
of ruthenium(II)-catalyst under nitrogen without the use of additive in water. This reaction was extended to various heteroaromatic aldehydes obtaining up to 88% yield of the desired 2-arylbenzimidazoles/2-arylbenzothiazoles. In a few cases, a small amount of diarylated compounds was formed depending on the aldehydes used. Additionally, antibiotic properties of the synthesized compounds have been screened
苯并咪唑/苯并噻唑是含有五元杂原子和苯环的杂环化合物。它们构成了众多生物活性化合物和天然产物的关键结构单元。由于含有苯并咪唑/苯并噻唑核的化合物及其衍生物具有令人感兴趣的生物活性,因此正在不断努力开发改进的合成方法来合成这些具有生物学重要性的化合物。受其生物学特性的启发,已尝试在水中使用 N^O 螯合钌 (II) 催化剂合成 2-芳基苯并咪唑和 2-芳基苯并噻唑。通过邻苯二胺或邻氨基苯硫酚与芳香醛在 5 mol% 钌 (II) 催化剂存在下在氮气下反应制备了一系列 2-芳基苯并咪唑和 2-芳基苯并噻唑,包括一些新的衍生物。在水中使用添加剂。该反应扩展到各种杂芳族醛,得到所需的 2-芳基苯并咪唑/2-芳基苯并噻唑的产率高达 88%。在少数情况下,根据所使用的醛,会形成少量二芳基化合物。此外,已使用标准圆盘扩散法筛选合成化合物的抗生素特性。该反应扩展到各种杂芳族醛,得到所需的 2-芳基苯并咪唑/2-芳基苯并噻唑的产率高达
Room Temperature Anhydrous Suzuki–Miyaura Polymerization Enabled by C−S Bond Activation
cross-coupling reaction between (hetero)aryl boronic esters and arylsulfides was explored, of which universality was exemplified with thirty small molecules and twelve alternating conjugated polymers. Mechanism studies revealed the importance of room temperature and anhydrous condition in reducing the homocoupling defects and enhancing the optoelectronic properties of the conjugated polymers.
Ni-based catalytic systems for the arylation of heteroarenes with arylhalides and triflates have been established. Ni(OAc)2/bipy is a general catalyst for aryl bromides/iodides, and Ni(OAc)2/dppf is effective for aryl chlorides/triflates. Thiazole, benzothiazole, oxazole, benzoxazole, and benzimidazole are applicable as heteroarene coupling partners. A rapid synthesis of febuxostat, a drug for gout